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Basement thrust sheets in the Clearwater orogenic zone, central Idaho and western Montana ( USA).

January 1, 1987

The Clearwater orogenic zone in central Idaho and W Montana contains at least 2 major NE-directed Cordilleran thrust plates of Early Proterozoic metasedimentary and metaigneous rocks that overrode previously folded Middle Proterozoic rocks of the Belt basin in Cretaceous time. The northeastward migration of the resultant thickened wedge of crustal material combined with Cretaceous subduction along the W continental margin produced a younger N Bitterroot lobe of the Idaho batholith relative to an older S Atlanta lobe. Eocene extensional unroofing and erosion of the Bitterroot lobe has exposed the roots of the thick Cordilleran thrust sheets.-Author

Citation Information

Publication Year 1987
Title Basement thrust sheets in the Clearwater orogenic zone, central Idaho and western Montana ( USA).
DOI
Authors B. Skipp
Publication Type Article
Publication Subtype Journal Article
Series Title Geology
Series Number
Index ID 70014196
Record Source USGS Publications Warehouse
USGS Organization